PSA/H&R Clones the Department of Energy Colt 9mm SMG

Palmetto State Armory, under their Harrington & Richardson brand, has released a particularly neat model of 9mm AR. They talked about doing this “at some point” at SHOT Show 2024, but lo and behold it’s here and available on the cusp of SHOT 2025! Specifically, this is the Colt 633, an extra-short version of the Colt 9mm SMG. Originally released in 1985, Colt’s 9mm adaptation of the AR/M16 platform was never hugely successful against competitors like the MP5. This particular model, with a 7″ barrel, was only produced in very limited numbers originally, with the Department of Energy being the only significant purchaser. Why does the DoE need submachine guns, you might ask? Because they are legally responsible for security for nuclear material transportation and facilities.

This new clone of the 633 form H&R/PSA comes with a stabilizing brace that is designed to very closely resemble the original Colt collapsing stock. It uses the same sort of modified Uzi magazines as the original Colts, and is a very good external reproduction while featuring modern internals that are rathe improved form the 1985 state of the art. The most evident non-original feature is the threaded muzzle, which gives a level of flexibility that I suspect most people will appreciate despite its non-originality.

Disclaimer: PSA sent me this for filming. I paid for the SRB registration.

15 Comments

  1. H&R also made some M-14 rifles. I was issued a brand new M-14 National Match at Camp Perry in 1967. Made by H&R, it was a minute of angle rifle, and I got 2 silver medals with it. We brought it back to Connecticut with us, for the state rifle team.

    • There’s an H&R M16A1 lower with a Model 921 upper in the battalion armory right now; I always look for it and the couple of GM Hydromatic lowers whenever I’m in there to make sure they’re still up. Living history

  2. I have a few H&Rs but they are in guages not calibers.The also made the T-48 which was a version of the FN FAL for US trials i believe.

  3. One of these days, I want Ian to do an episode on “Weapons of the DOE”, and go over all the amazing stuff they’ve purchased over the years. I know I’ll never see it, but I want to know more about those autonomous remote weapons stations they’ve been purchasing for inside the storage buildings… I have this image of a guy in a secure room somewhere with a Playstation controller having the time of his life with all those pods covering a nuclear fuel site…

    That’d be a really cool job to have for a former machinegunner.

    • Sounds like such a job would involve giving paranoia to any intruders looking to swipe uranium for “incredibly obviously evil unauthorized science fair projects”. I could be wrong.

  4. Don’t drop a loaded magazine. It unloads faster than if you were firing it full auto.

    I carried the 10.5″ Colt 635 at my agency. It was fun to shoot. A couple of times they had enough ammo left that they let us do full mag dumps, and that was a hoot.

  5. So. The FBI guys at the end of “The Peacemaker” has 635s.

    And the OGA hit squad at the beginning of “The Siege” had them as well.

    Plus the DOE connection. Enough reason for me.

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